167991811478 has 16 divisors (see below), whose sum is σ = 253906520400. Its totient is φ = 83357316576.

The previous prime is 167991811447. The next prime is 167991811549. The reversal of 167991811478 is 874118199761.

167991811478 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 167991811478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80525 + ... + 585207.

It is an arithmetic number, because the mean of its divisors is an integer number (15869157525).

Almost surely, 2^167991811478 is an apocalyptic number.

167991811478 is a deficient number, since it is larger than the sum of its proper divisors (85914708922).

167991811478 is a wasteful number, since it uses less digits than its factorization.

167991811478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505951.

The product of its digits is 6096384, while the sum is 62.

The spelling of 167991811478 in words is "one hundred sixty-seven billion, nine hundred ninety-one million, eight hundred eleven thousand, four hundred seventy-eight".